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Optimum active twist input scenario for performance improvement and vibration reduction of a helicopter rotor

机译：最佳主动扭曲输入场景，可提高直升机旋翼的性能并降低其振动

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In this paper, the best actuation scenario is sought using a multitude of active twist control inputs taking advantage of a global search algorithm to improve performance and reduce vibration of a helicopter rotor. The active twist schemes include a single harmonic, multiple harmonic, and three different segmented non-harmonic actuation cases. An advanced particle swarm assisted genetic algorithm (PSGA) is employed for the optimizer. In addition, a comprehensive rotorcraft analysis code CAMRAD II is used to reach the trim and to predict the rotor power and hub vibratory loads. A scale-down BO-105 model is used for the reference rotor while assuming the actuator material embedded in the blade structure. Among the active twist control inputs, the non-harmonic cases show the best performance gains in reducing the hub vibrations and power consumptions. The hub vibration is reduced by up to 87% while the rotor power required is decreased by 3.3% as compared to the baseline uncontrolled rotor in low speed descending flight condition when using the non-harmonic active twist schedules. The resulting optimized actuation profiles are found for each of the active twist control cases and the physical mechanism leading to less vibration and power consumption is discussed. The Pareto optimum is also examined to illustrate the simultaneous reduction in the power required and the hub vibration of the rotor. (C) 2016 Elsevier Masson SAS. All rights reserved.
机译：在本文中，利用全局主动搜索算法来利用多种主动扭转控制输入来寻求最佳的驱动情况，以改善性能并减少直升机旋翼的振动。主动扭曲方案包括单谐波，多谐波和三种不同的分段非谐波驱动情况。优化程序采用了先进的粒子群辅助遗传算法（PSGA）。此外，还使用了全面的旋翼机分析代码CAMRAD II来达到修整并预测旋翼功率和轮毂振动负载。按比例缩小的BO-105模型用于参考转子，同时假定执行器材料嵌入叶片结构中。在主动扭转控制输入中，非谐波情况在减少轮毂振动和功耗方面表现出最佳性能。与使用非谐波主动扭转计划的低速下降飞行条件下的基线不受控制的转子相比，轮毂振动最多可降低87％，而所需的转子功率则可降低3.3％。针对每个主动扭转控制情况找到了优化的致动曲线，并讨论了导致较少振动和功耗的物理机制。还检查了帕累托最优值，以说明所需功率的同时减少和转子的轮毂振动。 （C）2016 Elsevier Masson SAS。版权所有。

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